Strbet



(No Model.)

O. S. LONGSTREET.

AGTUATING MECHANISM AND SAPETYBRA-KE FORBLEvATORS. No. 272,965. Patented Peb.27,1883.

UNITED STATES PATENT OFFICE.

CHRISTOPHER S. LONGSTREET, OF NEW YORK, N. Y.

ACTUATING MECHANISM AllD SAFETY-BRAKE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 272,965, dated February 27, 1883.

Application filed August 15, 1882. (No model.)

To all whom it may concern:

Be it known that I, CHRISTOPHER 8. Lone- STREET, of the city, county, and State of New York, have invented certain new and useful Improvements in Actuating. Mechanism and Safety-Brakes for Elevators, of which the following is a specification, reference beinghad to the accompanying drawings, constituting part thereof, wherein similar letters of reference indicate corresponding parts.

Figure 1 shows a side elevation of one form of my invention, and Fig. 2 an end elevation of the same. Fig. 3 shows the operation of the device. Fig. 4 shows a cross section of the guide and upright of the elevator. Fig. 5 shows a side elevation of another form, and Fig. 6 an end elevation of the same, while Fig. 7 shows its operation.

This actuating mechanism is automatic upon an undue increase in the speed of the descending elevator and may be regulated by the balance to any desired rate of speed.

A is the guide, between which and a similar one opposite the elevator runs. 0 is the cross-head, and B the upright, of the ordinary platform-elevator, those portions alone being shown which aii'ord foundation for the location and operation of my device.

D D are guide plates or jaws embracing the guide A, which has a ledge, 1), upon its side, against whichthe toothed eccentric Q may bite. This ledge may be dispensed with by such a modification of the construction herein shown as will readily suggest itself to any mechanic and the inside face of the guide be utilized instead.

With regard to the first device the actuating mechanism consists of a vibrating lever, E, pivoted in any convenient frame, as I, upon the cross-head 0. This lever acts conjointly with the trip-lever M, pivoted between its extremities to the frame I. The trip-lever M has one arm reaching and connecting suitably, as by a pivot, with the wedge L, and the other arm extends backward and downward to rest upon the pin it, which counteracts the upward pressure of the spring N, which latter, when released, is the power bringing the safetybrakes into operation. The pin a may be pro- Vided Wlllfl a friction-roller to facilitate tripping. This pin n projects laterally from the shorter arm of the trigger S, and from its other arm-similarly projects the pin m. The trigger itself may be pivoted, as at p, in any suitable frame or standard, as T.

It will be easily understood that upon the pulling away of the supportingpin u the spring N and lever M, and consequently the brakes therewith connected, become operative. The automatic means for this purpose contemplated in my invention is a vibrating lever, E, having a segment-rack, f, cam or boss, 6, and claw It. An adjustable weight, as i, may be added on an arm, It, whereby the vibrations of the lever may be regulated and controlled. A portion of this curved extension or bow of the vibrating lever between the segment-rack fand the cam or boss 6 is toothless, and plays upon the concentric pins F, arranged on the toothed wheel G, which runs along the guide A, and is kept in constant contact therewith by a spiral spring, It. While the elevator descends at a regular rate of speed the wheel Gr revolves moderately and its circle of pins F are being brought constantly'and successively into sliding contact with the cam or boss e, thereby throwing it backward but not beyond the perpendicular, so that it again falls forward to be again repelled. Thetoothless curve 8 should be long enough to accommodate ordinary vibrations. When the velocity of the descending elevator becomes extraordinary, and the revolution of the wheelG consequently rapid, the pushes given by the pins F become violent and quickly overthrow the vibrating lever so far that the segment-rack f comes in turn into position to engage the pins F, which rack the lever backward until the claw it pulls the trigger S and trips the lever M.

With regard to the second and simpler form of my invention, I dispense with trip-lever, trigger, and spring. I use a vibrating lever, E, having similar smooth and toothed extensions s and f, and similarly operated by the pinion F. Instead of the cam or boss e, I use an arm, J, vibrated by the toothed wheel G, which runs alongside the guide A, and is revolved by suitable pins, a a, thereon. The extension or bow of the vibrating lever is connected with the safety-brake by a slotted link, K, in the slot of which works a pin on the extension or how. This link is pivoted to the brake and the length of its slot suited to accommodate ordinary vibrations. The movable arm H supports the wheels G and F. The balance t may be made self-locking at any point on the arm h by means of a screw and thread and depending weight.

As safety-brakes I prefer a wedge, L, and toothed eccentric Q, toggle-jointed together, as by O and P. In addition to the increased safety of the double brake, the eccentric acts to push home and key the wedge, owing to the form of connection used.

hat I claim as novel and useful and my invention is- 1. In actuating mechanism for the safetybrakes of elevators, a vibrating lever having a segment-rack adapted to engage and be operated by a toothed or frictional wheel running along the guideway, and havinga claw adapted to trip a set-lever, whereby the safety-brakes ot' the elevator are sprung into action, substantially as described.

2. In actuating mechanism for the safetybrakes of elevators, a set-lever operated by a spring and trigger and adapted to be tripped by the excessive oscillation of a vibrating lever consequent upon an increase in the velocity of the elevator beyond the normal rate, substantially as described.

3. In actuating mechanism for the safetybrakes of elevators, the combination of a set or trip lever and a vibrating lever provided with a claw, whereby such tripping is accomplished, substantially as described.

4. As a set-trigger in the specified combination of a set or trip lever and a vibrating lever furnished with a tripping-claw, a pivoted bar provided with a laterallyprojecting arm at each extremity, for the purpose in the combination substantially as described.

5. In actuating mechanism for the safetybrakes of elevators, a vibrating lever with a segment-rack and claw, adapted to act substantially as described.

6. In actuating mechanism for the safetybrakes of elevators, a toothed or frictional wheel running along the guideway, and provided with a pinion or pins adapted to engage with and operate the segment-rack of a vibrating lever upon excessive oscillation, substantially as described.

7. In actuating mechanism for the safetybrakes of elevators, a toothed or frictional wheel running alongthe guideway and adapted for periodical contact with a cam, boss, or pin upon a vibrating lever, whereby excessive oscillation of the lever is caused by excessive velocity of revolution of the wheel, in the manner and for the purpose substantially as described.

S. In actuating mechanism for the safetybrakes of elevators, a vibrating lever having a segment-rack connected with the brakes by a slotted link, substantially as described.

9. As a balance for the vibrating lever specitied, a depending weight adjustable by screw and thread along a suitable arm on the lever, substantially as described.

10. As a safety-brake for elevators, the combination of a wedge and toothed eccentric,

joined and operated in the manner and for the purpose substantially as described.

11. As safety-brakes and actuating mechanism for elevators, a vibrating balanced lever adapted by a segment-rack and pinion movement to bring into combined action a wedge and toothed eccentric, in the manner and for the purpose substantially as described.

12. As safety-brakes and actuating mechanism for elevators, a vibrating balanced lever adapted to pull a trigger, and thereby allow a spring and trip-lever to bring into combined action a wedge and toothed eccentric, in the manner and for the purpose substantially as described.

13. As a connection between a wedge as a safetybrake for elevators and a segment-rack and pinion movement as actuating mechanism, a siotted link pivoted to the wedge and its slot fitted to freely accommodate a pin on the extremity of the segment-rack, substantially as described.

CHRISTOPHER S. LONGSTREET.

\Vitnesses:

SIMEoN'FoRD, FRANCIS Senna, Jr. 

